单项选择题

Steep stairs can present a particular hazard to older people．（）

A．danger
B．case
C．picture
D．evidence

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单项选择题

Your dog needs at least 20 minutes of vigorous exercise every day．（）

A．physical
B．energetic
C．regular
D．free

单项选择题

I enjoyed the play-it had a clever plot and very funny dialogues．（）

A．long
B．boring
C．original
D．humorous

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